Details

Autor(en) / Beteiligte

• Anang, Emmanuella
• Liu, Hong
• Fan, Xianyuan
• Zhao, Dongye
• Gong, Xuan

Titel

Compositional evolution of nanoscale zero valent iron and 2,4-dichlorophenol during dechlorination by attapulgite supported Fe/Ni nanoparticles

Ist Teil von

• Journal of hazardous materials, 2021-06, Vol.412, p.125246-125246, Article 125246

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• Transformation of chloro-organic compounds by nFe(0) has been studied extensively, but limited study exists on the transformation and fate of nFe(0) during the dechlorination of chloro-organics even though such knowledge is important in predicting its surface chemistry, particularly, toxicity in the environment. In this study, the nFe(0) core became hollowed, collapsed and gradually corroded into poorly crystallized ferrihydrite (Fe5O3(OH)9) at the pristine reaction time, which later gave rise to lath-like lepidocrocite (γ-FeOOH), acicular goethite (α-FeOOH) and cubic magnetite (Fe3O4) by the end of the reaction time (120 min). Also, dechlorination of 2,4-DCP into 2-CP, 4-CP and phenol was achieved within 120 min. The rapid dechlorination of 2,4-DCP and transformation of nFe(0) could not be achieved significantly without doping Ni on nFe(0) and supporting on attapulgite. The schematic representation of the transformation and compositional evolution of nFe(0) in A-nFe/Ni was proposed. These findings are critical in understanding the compositional evolution and the fate of nFe(0) upon reaction with chloro-organics and can provide guidance for more efficient uses of the nFe(0) reactivity towards the target contaminants in groundwater remediation. [Display omitted] •Transformation and composition evolution of nFe(0) in A-nFe/Ni composite was investigated after reaction with 2,4-DCP.•The nFe(0) core corrodes into ferrihydrite and gives rise to lepidocrocite, goethite and magnetite in 120 min•The complete dechlorination of 2,4-DCP into 2-CP, 4-CP and phenol was also achieved within 120 min•Doping of nickel and loading of nFe/Ni onto attapulgite enhances nFe(0) transformation and 2,4-DCP dechlorination.•These findings are critical in groundwater remediation/wastewater treatment.